Computer Assisted Spore Classification based on Ornament Spatial Distribution Analysis – An Application to Emsian Miospores from Saudi Arabia

Conference (2006)

Enigmatic Givetian palynomorphs

Report (2006)

Morphometric analysis of proposed evolutionary lineages of Early Devonian land plant spores

in Geological Magazine (2005), 142(3), 241-253

Early Devonian miospore assemblages from 'La Gileppe' (Eastern Belgium) include five varieties of trilete spore belonging to the genus Emphanisporites. These five varieties show a continuous variation of ... [more ▼]

Early Devonian miospore assemblages from 'La Gileppe' (Eastern Belgium) include five varieties of trilete spore belonging to the genus Emphanisporites. These five varieties show a continuous variation of their morphological characteristics. The variation in morphological characteristics can be related to the evolution of morphological features and allows us to define the Emphanisporites micromatus Morphon. A statistical evaluation of this population highlights the interdependence of almost all morphological parameters. This study proves the increase in size of ornamental and structural parameters over several million years. The biometric changes and the progressive replacement of older morphotypes by younger ones indicate that a temporal link exists between these different varieties. Two phylogenetic hypotheses for the E. micromatus Morphon are proposed. This morphological evolution is so far observed only on the Eastern Old Red Sandstone Continent and defines a palaeophytogeographic sinuosus-zavallatus Province. [less ▲]

The Middle-Devonian proto-ovule Runcaria heinzelinii Stockmans 1968

Conference (2005)

Stratigraphic palynology of Devonian boreholes from northern Saudi Arabia

in Carnets de Géologie = Notebooks on Geology (2005), Memoir 2005/02, CG2005 M02/01

Contribution to the integrated chitinozoan and miospore biostratigraphy of the Serra Grande Group (Silurian - Lower Devonian) in the Parnaíba Basin, northeast Brazil

in Revista Española de Micropaleontología (2005), 37

The Moesian Terrane during the Lochkovian - a new palaeogeographic and phytogeographic hypothesis based on miospore assemblages

in Palaeogeography, Palaeoclimatology, Palaeoecology (2004), 208(3-4), 225-233

The relative position of terranes during the Palaeozoic can be indicated by a combination of palaeomagnetic and floral/faunal evaluation. Palaeomagnetic data are absent from the Moesian Terrane, South ... [more ▼]

The relative position of terranes during the Palaeozoic can be indicated by a combination of palaeomagnetic and floral/faunal evaluation. Palaeomagnetic data are absent from the Moesian Terrane, South-Eastern Europe, and its position is here estimated thanks to palaeophytogeographic considerations based on miospore assemblages. Miospore assemblages have been studied in two boreholes from northern Bulgaria. Preliminary analyses of chitinozoans, acritarchs and phytodebris have already been published. The oldest samples were considered to be of Pridoli age based on chitinozoan data, but here we provide new miospore evidence suggesting a Lochkovian age. This age determination is in accordance with the new interpretations based on previously published acritarch data. It is likely that the previous Pridoli age determination was influenced by Pridoli chitinozoans being reworked into the Lochkovian. The miospores are typical of assemblages only present in a small area of Avalonia and the western part of the Baltica Plate, and belong to the sinuosus-zavallatus (S-Z) Phytogeographic Province, defined here. On the contrary to the miospores, marine palynomorphs have affinity with Gondwanan assemblages. The different palaeogeographic affinities of the different palynomorph groups are not necessarily in contradiction, as it has recently been suggested that the Rheic Ocean did not act, around the Silurian-Devonian boundary, as a hermetic barrier for transoceanic chitinozoan and acritarch exchange. Therefore, the results are tentatively interpreted as indicating that the Moesian Terrane, belonging to the S-Z Province, was close to southern Laurussia during the Lower Devonian. This northern position of the Moesian Terrane during the Lower Devonian conflicts with most current palaeogeographic reconstructions, but partially supports the hypothesis of a migration of this terrane from Gondwana to Laurussia during the Palaeozoic. The possible presence of reworked palynomorphs in the Lochkovian may reflect early tectonic events associated with the close proximity of the Moesian Terrane and the Dobrudgea periphery of Palaeo-Europe. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

Position of the Moesian platform at the Lochkovian. Hypothesis based on miospores

Conference (2004)

Llandovery biostratigraphy of the Paraná Basin, East Paraguay

Conference (2004)

Late Eifelian to earliest Givetian miospore assemblages from Central Northern Saudi Arabia

Conference (2004)